70
TROUBLESHOOTING
4-2-6. When Fan does not operate
COMP is on?
Start
Run Forced Operation
The voltage
between GND in Main PBA and CN74
#4 is 8-12 VDC
FAN operates normally.
Freezer/Fridge/Home
Bar Door S/W is closed.
Check after closing the
Door. When there is Door
alarming, repair the Door
S/W connector.
Upon the initial power on,
Comp and F/C-Fan operate
for 5 minutes regardless of
the conditions.
Plug in again after 5
minutes from the power off.
◆
Possible Causes
1. Defective FAN-MOTOR
2. Contact problem at the terminal
3. FG signal error (Refer to Fan-Motor circuit in this manual)
NO
YES
YES
NO
NO
YES
The voltage between
GND and CN74 #4 repeats the change from
7-12VDC to lower than 2VDC.
Replace MAIN PBA
Reading with Door closed.
-.OPEN 5V, CLOSE 0V
NO
YES
Pulse signal(FG) generated from the Fan motor rotation is transmitted through CN74 #9(F), #11(C)
Micom senses these signal.
If Micom senses no signal, Micom make Fan Motor stop for 10 sec and try to operate it again.
Micom keeps doing the same procedure 4 times until Micom receive the signal.
If it still fails, MICOM stop trying for 10 minutes.
This procedure prevents the motor from overload when foreign substances such as ice built
up around the motor restrict motor rotation.
Note
The voltage between GND in Main PBA
and CN74 #2 is 8-12Vdc
NO
The voltage between
GND and CN74 #2 repeats the change from
7-12VDC to lower than 2VDC.
YES
For C-FAN
For C-FAN
For F-FAN
For F-Fan
- This model has BLDC FAN motor. BLDC motor is driven by DC7~12V
- F-Fan motor usually runs together with the Compressor. Once the door is open and closed at high
ambient temperature, F-Fan motor put off its operation for one minute. Therefore, you are advised
not to take it as an error.
- When fridge door is open, the F-Fan motor stops.
CN74
☞
Checking method of C-Fan motor voltage
-. Read the voltage between MAIN PBA GND and CN74 #2
-. If it has 8~12 voltage, It's normal.
(Same method is applied to other Fan Motor)
